TY - JOUR
T1 - Exceptional Points in Random-Defect Phonon Lasers
AU - Lü, H.
AU - Özdemir, S. K.
AU - Kuang, L. M.
AU - Nori, Franco
AU - Jing, H.
N1 - Funding Information:
L.-M. K. is supported by the 973 Program under Grant No. 2013CB921804 and the National Natural Science Foundation of China under Grants No. 11375060 and No. 11434011. H. J. is supported by the National Natural Science Foundation of China under Grants No. 11474087 and No. 11774086. S. K. Ö. is supported by ARO Grant No. W911NF-16-1-0339 and the Pennsylvania State University Materials Research Institute. F. N. is supported by the RIKEN iTHES Project, the MURI Center for Dynamic Magneto-Optics via AFOSR Grant No. FA9550-14-1-0040, the IMPACT program of JST, CREST Grant No. JPMJCR1676, a JSPS Grant-in-Aid for Scientific Research (A), and a grant from the Sir John Templeton Foundation.
Publisher Copyright:
© 2017 American Physical Society.
PY - 2017/10/27
Y1 - 2017/10/27
N2 - Intrinsic defects in optomechanical devices are generally viewed to be detrimental for achieving coherent amplification of phonons, and great care has thus been exercised in fabricating devices and materials with no (or a minimal number of) defects. Contrary to this view, here we show that, by surpassing an exceptional point (EP), both the mechanical gain and the phonon number can be enhanced despite increasing defect losses. This counterintuitive effect, well described by an effective non-Hermitian phonon-defect model, provides a mechanical analog of the loss-induced purely optical lasing. This opens the way to operating random-defect phonon devices at EPs.
AB - Intrinsic defects in optomechanical devices are generally viewed to be detrimental for achieving coherent amplification of phonons, and great care has thus been exercised in fabricating devices and materials with no (or a minimal number of) defects. Contrary to this view, here we show that, by surpassing an exceptional point (EP), both the mechanical gain and the phonon number can be enhanced despite increasing defect losses. This counterintuitive effect, well described by an effective non-Hermitian phonon-defect model, provides a mechanical analog of the loss-induced purely optical lasing. This opens the way to operating random-defect phonon devices at EPs.
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U2 - 10.1103/PhysRevApplied.8.044020
DO - 10.1103/PhysRevApplied.8.044020
M3 - Article
AN - SCOPUS:85032895206
SN - 2331-7019
VL - 8
JO - Physical Review Applied
JF - Physical Review Applied
IS - 4
M1 - 044020
ER -